mldub2 Posted April 5, 2011 Share Posted April 5, 2011 I just put a l28et in my 75 280z and am using the stock alternator from the 75 (new and tested) and a new voltage regulator. When I start the car it runs off the battery. When I remove the negitive cable from the battery car turns off. I have taken the alternator to the auto parts store2 times. Both times they said it was good. PLEASE ANY HELP. Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 6, 2011 Share Posted April 6, 2011 Do you have a volt/ohm meter? The 1975 FSM has a thorough test procedure in the Engine Electrical section. Have the regulator tested also. If the regulator is one of the newer solid state ones it might have been damaged when you removed the cable. Or it might have been bad from the start. The old points type might not like the power surges from removing and replacing the cable either. Did everything work right pre-turbo motor? Quote Link to comment Share on other sites More sharing options...
schicksal Posted April 6, 2011 Share Posted April 6, 2011 Is the alternator brand new or re-manufactured? I ask because I just had to change the alternator on my 620 with a re-manufactured unit. I had them bench test it before I bought it tested good but when I put it in the truck it would not charge. I replaced the voltage regulator and checked grounds and everything else. Turned out the alternator was bad and not charging the unit they replaced it with works great now. Just make sure you check all the wiring on your charging system like clean grounds and contacts. Quote Link to comment Share on other sites More sharing options...
NewZed Posted April 6, 2011 Share Posted April 6, 2011 (edited) That's a good point. There was a guy over on Classiczcar who had his brand new alternator tested several times at the auto parts store and it showed as good, but his measurements showed that it was only putting out 12 volts. You need ~ 14.8 to properly charge the battery. He had to put up a fight to get a replacement. Does your charge light come on before the engine is started, then go off? Edited April 6, 2011 by NewZed Quote Link to comment Share on other sites More sharing options...
mldub2 Posted April 6, 2011 Author Share Posted April 6, 2011 I don't know if everything worked before turbo swap. No engine when I got it and it's a new alternator. I will look in the FSM and see what happens. Quote Link to comment Share on other sites More sharing options...
mldub2 Posted April 6, 2011 Author Share Posted April 6, 2011 I don't have a charge light just a 60 amp gauge and that never goes over 0 amp. When I turn on the light it drop down below 0 amps. Quote Link to comment Share on other sites More sharing options...
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